Very little of the standard C++ library is not "kernel safe". If a bit of it might need to allocate, you may provide it a kernel-grade allocator to use; but you

Very little of the standard C++ library is not "kernel safe". If a bit of it might need to allocate, you may provide it a kernel-grade allocator to use; but you probably use custom kernel containers, for other reasons. If you don't want any filebufs, you do not make them. And of course asm {} works the same regardless.